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Temperature detection circuit and mobile communication equipment

A technology of temperature detection circuit and mobile communication equipment, which is applied in the direction of telephone communication, thermometer, branch office equipment, etc., can solve the problem of high power consumption of the whole machine, achieve the effects of ensuring safety, realizing timely detection, and simple circuit structure

Inactive Publication Date: 2010-07-07
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing mobile phone temperature detection circuit adopts an application processor to collect and judge the system temperature, which causes large power consumption of the whole machine, it provides a temperature detection circuit with low power consumption and simple structure. Realize the timely and reliable detection of the temperature of the whole machine

Method used

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  • Temperature detection circuit and mobile communication equipment
  • Temperature detection circuit and mobile communication equipment
  • Temperature detection circuit and mobile communication equipment

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Experimental program
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Embodiment 1

[0031] Embodiment one, see image 3 As shown, in the mobile phone circuit of this embodiment, in order to realize the effective detection of the temperature of the mobile phone without increasing the hardware cost of the mobile phone, the communication module inside the mobile phone is used as the voltage detection unit to realize the voltage division of the voltage divider circuit. Timing detection of voltage values ​​at nodes.

[0032] Such as image 3 As shown, the built-in NTC thermistor NTC1 in the mobile phone battery is used to build the voltage divider circuit required for the temperature detection circuit. One end of the thermistor NTC1 is grounded, and the other end is connected to the ID terminal of the battery. The ID terminal of the battery is connected to one of the stable DC power sources in the mobile phone system through the fixed resistor R1, such as the DC power Vio used to supply power to the GPIO port of the application processor. The ID terminal of the ba...

Embodiment 2

[0043] Embodiment two, see Figure 5 As shown, this embodiment refers to the design idea of ​​dynamically adjusting the voltage division value V1 of the ADC interface to read the voltage division circuit proposed in the first embodiment, and appropriately modifies the software program of the application processor, so that the existing temperature The detection circuit structure is to use the ADC interface of the application processor in the mobile phone to directly read the voltage value V1 at the voltage dividing node in the voltage dividing circuit, and perform timing detection of the current temperature of the whole machine circuit.

[0044] The principle of adopting this design scheme is simple, because only one chip of the application processor needs to judge the temperature state, so the debugging is simple and the state is stable. The disadvantage is that the ADC interface of the application processor needs to regularly detect the voltage value V1, so even when the mobi...

Embodiment 3

[0046] Embodiment three, see Image 6 As shown, the mobile phone circuit of this embodiment uses a comparator to design a voltage detection unit. After connecting the ID terminal of the battery with the resistor R1 of fixed resistance to form a voltage divider circuit, it is connected to an independent voltage comparator at the same time, such as the non-inverting input terminal of the comparator, and the inverting input terminal of the comparator is connected to the reference level, that is The temperature alarm voltage corresponding to the temperature alarm voltage value is also represented by Vref. The output end of the comparator is connected to the application processor, such as a GPIO port of the application processor, to transmit an alarm signal.

[0047] Its working principle is: when the temperature change of the battery causes the voltage value V1 across the thermistor NTC1 to drop to the temperature alarm voltage Vref, the output level of the comparator jumps, ther...

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Abstract

The invention discloses a temperature detection circuit and a mobile communication equipment, comprising a divider circuit consisting of a thermal resistor and a fixed resistor connected together, wherein, the dividing point of the divider circuit is connected with a voltage detection unit; when detecting that the voltage value at the dividing point reaches the preset temperature alarm voltage valve, the voltage detection unit outputs an alarm signal to an application processor to close part of or the whole circuit in the system by the application processor in order to reduce the temperature of the whole machine. With a simple structure, the temperature detection circuit of the invention realizes timely detection of the whole system temperature and guarantees security of equipment using process, particularly applicable to the mobile communication equipment, such as the mobile phone and the PDA, with characteristics of high electricity consumption and concentrated heating when the system is in operation.

Description

technical field [0001] The invention belongs to the technical field of mobile communication equipment, and in particular relates to a circuit design scheme for detecting the temperature of a system circuit in a mobile communication equipment and a mobile communication equipment designed using the temperature detection circuit. Background technique [0002] With the continuous improvement of the operating frequency of smart phones on the market and the characteristics of multi-threaded simultaneous work, "heating" has become an important problem faced by the smart phone field. In recent years, there have been constant reports of mobile phone batteries exploding or catching fire in the market. Therefore, the temperature detection and self-protection mechanism of smart phones under extreme temperatures is particularly important. [0003] At present, most chips with MCU (Micro Controller Unit) functions on the market include temperature protection as one of their functions. Usu...

Claims

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Application Information

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IPC IPC(8): H04B1/40H04M1/24G01K1/02G01K7/22H04B1/3827
CPCY02B60/50Y02A30/00
Inventor 张伟
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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